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The .280 Ackley Improved (.280 AI) was the result of the .280 Remington case modification by P.O Ackley, who pushed out the sidewalls at the shoulder to near parallel and steepened the shoulder angle to 40 degrees in order to increase powder capacity, thus along with increasing the allowable pressure, resulted in increasing the bullet initial velocity by approximately 100 fps.
In Europe the .280 Remington is not popular in bolt-action rifles since it competes directly with the 7×64mm, which is of the almost exact same size as the .280 Remington but has slightly more power, because of having a slightly higher maximum allowed chamber pressure and a slightly higher case capacity. The twist rate for the 7x64 is 1 in 8. ...
A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. ... and .280 Rimless. Once manufactured by Remington and Winchester. .28 ...
.260 Remington.264 LBC-AR.264 Winchester Magnum.270 Weatherby Magnum.270 Winchester.270 Winchester Short Magnum.275 H&H Magnum.275 No 2 Magnum.275 Rigby.276 Enfield.276 Pedersen.277 FURY.277 Wolverine.28 Nosler.280 Ackley Improved.280 British.280 Flanged.280 Jeffery.280 Remington.280 Ross.284 Winchester
The recoil lug was a simple plate of steel sandwiched between the barrel and receiver [2] (like on Savage Model 1920, but even simpler). ... 280 Rem 30-06 .375 H&H
The .280 British was an experimental rimless ... distance and produced recoil closer to that of ... , 6.8mm SPC, 7mm Benchrest Remington, .280/30 ...
In January 2002, Dave Anderson of Guns Magazine compared four of his favorite 7mm cartridges (7×57mm Mauser, .280 Remington, .284 Winchester, and 7mm-08 Rem.), and concluded: "But consider everything -- performance, recoil, rifle size and weight, rifle availability, ammunition availability and selection -- and the winner, rather to my surprise ...
The American .280 Remington cartridge is probably the closest ballistic twin of the 7×64mm. When compared to the 7×64mm, the .280 Remington has a slightly lower maximum allowed chamber pressure and as an American 7 mm cartridge has a slightly smaller groove diameter. European 7 mm cartridges all have 7.24 mm (0.285 in) grooves Ø diameter. [6]